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Stainbank, Stephanie; Spezzaferri, Silvia; De Boever, Eva; Bouvier, Anne-Sophie; Chilcott, Colin; de Leau, Erica S; Foubert, Anneleen; Kunkelova, Tereza; Pichevin, Laetitia; Raddatz, Jacek; Rüggeberg, Andres; Wright, James D; Yu, Siyao M; Zhang, Manlin; Kroon, Dick (2020): Long-term, high-resolution foraminiferal geochemical records (element/Ca) from IODP Site 359-U1467 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.914882

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Abstract:
Due to their large heat and moisture storage capabilities, the tropics are fundamental in modulating both regional and global climate. Furthermore, their thermal response during past extreme warming periods, such as super interglacials, is not fully resolved. In this regard, we present high-resolution (analytical) foraminiferal geochemical (δ^18^O and Mg/Ca) records for the last 1800 kyr from the shallow (487 m) Inner Sea drift deposits of the Maldives archipelago in the equatorial Indian Ocean. Considering the diagenetic susceptibility of these proxies, in carbonate-rich environments, we assess the integrity of a suite of commonly used planktonic and benthic foraminifera geochemical datasets (Globigerinoides ruber (white), Globigerinita glutinata (with bulla), Pulleniatina obliquiloculata (with cortex) and Cibicides mabahethi) and their use for future paleoceanographic reconstructions.
Using a combination of spot Secondary Ion Mass Spectrometer, Electron Probe Micro-Analyzer and Scanning Electron Microscope image data, it is evident that authigenic overgrowths are present on both the external and internal test (shell) surfaces, yet the degree down-core as well as the associated bias is shown to be variable across the investigated species and proxies. Given the elevated authigenic overgrowth Mg/Ca (∼12–22 mmol/mol) and δ^18^O values (closer to the benthic isotopic compositions) the whole-test planktonic G. ruber (w) geochemical records are notably impacted beyond ∼627.4 ka (24.7 mcd). Yet, considering the setting (i.e. bottom water location) for overgrowth formation, the benthic foraminifera δ^18^O record is markedly less impacted with only minor diagenetic bias beyond ∼790.0 ka (28.7 mcd). Even though only the top of the G. ruber (w) and C. mabahethi records (whole-test data) would be suitable for paleo-reconstructions of absolute values (i.e. sea surface temperature, salinity, seawater δ^18^O), the long-term cycles, while dampened, appear to be preserved. Furthermore, planktonic species with thicker-tests (i.e. P. obliquiloculata (w/c)) might be better suited, in comparison to thinner-test counter-parts (i.e. G. glutinata (w/b), G. ruber (w)), for traditional whole-test geochemical studies in shallow, carbonate-rich environments. A thicker test equates to a smaller overall bias from the authigenic overgrowth. Overall, if the diagenetic impact is constrained, as done in this study, these types of diagenetically altered geochemical records can still significantly contribute to studies relating to past tropical seawater temperatures, latitudinal scale ocean current shifts and South Asian Monsoon dynamics.
Keyword(s):
early diagenesis; Foraminifera; IODP; Maldives; Mg/Ca; Stable isotopes
Supplement to:
Stainbank, Stephanie; Spezzaferri, Silvia; De Boever, Eva; Bouvier, Anne-Sophie; Chilcott, Colin; de Leau, Erica S; Foubert, Anneleen; Kunkelova, Tereza; Pichevin, Laetitia; Raddatz, Jacek; Rüggeberg, Andres; Wright, James D; Yu, Siyao M; Zhang, Manlin; Kroon, Dick (2020): Assessing the impact of diagenesis on foraminiferal geochemistry from a low latitude, shallow-water drift deposit. Earth and Planetary Science Letters, 545, 116390, https://doi.org/10.1016/j.epsl.2020.116390
Related to:
Coverage:
Latitude: 4.850457 * Longitude: 73.283705
Minimum Elevation: -487.0 m * Maximum Elevation: -487.0 m
Event(s):
359-U1467 (MAL-9A) * Latitude: 4.850457 * Longitude: 73.283705 * Elevation: -487.0 m * Location: Maldives * Campaign: Exp359 * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1AGEAgeka BPStainbank, StephanieGeocode
2Depth, compositeDepth compmcdStainbank, Stephanie
3Sample code/labelSample labelStainbank, Stephanie
4Sample IDSample IDStainbank, StephanieMg/Ca Sample ID
5Globigerinoides ruber, Aluminium/Calcium ratioG. ruber Al/Cammol/molStainbank, StephanieICP-OESEdinburgh ratios (Al396/Ca315); size fraction: 212-250 μm
6Globigerinoides ruber, Iron/Calcium ratioG. ruber Fe/Cammol/molStainbank, StephanieICP-OESEdinburgh ratios (Fe259/Ca315); size fraction: 212-250 μm
7Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molStainbank, StephanieICP-OESEdinburgh ratios (Mg279/Ca315); size fraction: 212-250 μm
8Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molStainbank, StephanieICP-OESEdinburgh ratios (Mg280/Ca315); size fraction: 212-250 μm
9Globigerinoides ruber, Manganese/Calcium ratioG. ruber Mn/Cammol/molStainbank, StephanieICP-OESEdinburgh ratios (Mn257/Ca315); size fraction: 212-250 μm
10Globigerinoides ruber, Strontium/Calcium ratioG. ruber Sr/Cammol/molStainbank, StephanieICP-OESEdinburgh ratios (Sr407/Ca315 ); size fraction: 212-250 μm
11Globigerinoides ruber, Aluminium/Calcium ratioG. ruber Al/Cammol/molStainbank, StephanieICP-OESFrankfurt ratios (Al167.0/Ca315); size fraction: 212-250 μm
12Globigerinoides ruber, Iron/Calcium ratioG. ruber Fe/Cammol/molStainbank, StephanieICP-OESFrankfurt ratios (Fe2382/Ca315); size fraction: 212-250 μm
13Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molStainbank, StephanieICP-OESFrankfurt ratios (Mg279.5/Ca315); size fraction: 212-250 μm
14Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molStainbank, StephanieICP-OESFrankfurt ratios (Mg280/Ca315); size fraction: 212-250 μm
15Globigerinoides ruber, Manganese/Calcium ratioG. ruber Mn/Cammol/molStainbank, StephanieICP-OESFrankfurt ratios (Mn257.6/Ca315); size fraction: 212-250 μm
16Globigerinoides ruber, Strontium/Calcium ratioG. ruber Sr/Cammol/molStainbank, StephanieICP-OESFrankfurt ratios (Sr421.5/Ca315); size fraction: 212-250 μm
Size:
4847 data points

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